package com.yuliang.utils.util;

import lombok.extern.slf4j.Slf4j;

import org.apache.commons.lang3.ArrayUtils;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.net.URLEncoder;
import java.nio.charset.StandardCharsets;
import org.apache.commons.io.IOUtils;

/**
 * 文件处理工具类
 *
 * @author ruoyi
 */
@Slf4j
public class FileUtils {
    public static String FILENAME_PATTERN = "[a-zA-Z0-9_\\-\\|\\.\\u4e00-\\u9fa5]+";

    /**
     * 写数据到文件中
     * @param data 数据
     * @return 目标文件
     * @throws IOException IO异常
     */
    public static String writeImportBytes(byte[] data, String importPath) throws IOException {
        //设置导入的地址
        return writeBytes(data, importPath);
    }

    /**
     * 写数据到文件中
     *
     * @param data 数据
     * @param uploadFilePath 目标文件
     * @return 目标文件
     * @throws IOException IO异常
     */
    public static String writeBytes(byte[] data, String uploadFilePath) throws IOException {
        FileOutputStream fos = null;
        try {
            File file = new File(uploadFilePath);
            fos = new FileOutputStream(file);
            fos.write(data);
        } finally {
            IOUtils.close(fos);
        }
        return uploadFilePath;
    }

    /**
     * 删除文件
     *
     * @param filePath 文件
     * @return
     */
    public static boolean deleteFile(String filePath)
    {
        boolean flag = false;
        File file = new File(filePath);
        // 路径为文件且不为空则进行删除
        if (file.isFile() && file.exists())
        {
            flag = file.delete();
        }
        return flag;
    }
    /**
     * 下载文件名重新编码
     *
     * @param request 请求对象
     * @param fileName 文件名
     * @return 编码后的文件名
     */
    public static String setFileDownloadHeader(HttpServletRequest request, String fileName) throws UnsupportedEncodingException {
        final String agent = request.getHeader("USER-AGENT");
        String filename = fileName;
        if (agent.contains("MSIE")) {
            // IE浏览器
            filename = URLEncoder.encode(filename, "utf-8");
            filename = filename.replace("+", " ");
        } else if (agent.contains("Firefox")) {
            // 火狐浏览器
            filename = new String(fileName.getBytes(), "ISO8859-1");
        } else if (agent.contains("Chrome")) {
            // google浏览器
            filename = URLEncoder.encode(filename, "utf-8");
        } else {
            // 其它浏览器
            filename = URLEncoder.encode(filename, "utf-8");
        }
        return filename;
    }

    /**
     * 下载文件名重新编码
     *
     * @param response 响应对象
     * @param realFileName 真实文件名
     */
    public static void setAttachmentResponseHeader(HttpServletResponse response, String realFileName) throws UnsupportedEncodingException
    {
        String percentEncodedFileName = percentEncode(realFileName);

        StringBuilder contentDispositionValue = new StringBuilder();
        contentDispositionValue.append("attachment; filename=")
                .append(percentEncodedFileName)
                .append(";")
                .append("filename*=")
                .append("utf-8''")
                .append(percentEncodedFileName);

        response.addHeader("Access-Control-Expose-Headers", "Content-Disposition,download-filename");
        response.setHeader("Content-disposition", contentDispositionValue.toString());
        response.setHeader("download-filename", percentEncodedFileName);
    }

    /**
     * 百分号编码工具方法
     *
     * @param s 需要百分号编码的字符串
     * @return 百分号编码后的字符串
     */
    public static String percentEncode(String s) throws UnsupportedEncodingException
    {
        String encode = URLEncoder.encode(s, StandardCharsets.UTF_8.toString());
        return encode.replaceAll("\\+", "%20");
    }

    /**
     * 获取图像后缀
     *
     * @param photoByte 图像数据
     * @return 后缀名
     */
    public static String getPicExtendName(byte[] photoByte) {
        String strFileExtendName = "jpg";
        if ((photoByte[0] == 71) && (photoByte[1] == 73) && (photoByte[2] == 70) && (photoByte[3] == 56)
                && ((photoByte[4] == 55) || (photoByte[4] == 57)) && (photoByte[5] == 97))
        {
            strFileExtendName = "gif";
        }
        else if ((photoByte[6] == 74) && (photoByte[7] == 70) && (photoByte[8] == 73) && (photoByte[9] == 70))
        {
            strFileExtendName = "jpg";
        }
        else if ((photoByte[0] == 66) && (photoByte[1] == 77))
        {
            strFileExtendName = "bmp";
        }
        else if ((photoByte[1] == 80) && (photoByte[2] == 78) && (photoByte[3] == 71))
        {
            strFileExtendName = "png";
        }
        return strFileExtendName;
    }

    /**
     * 获取文件名称 /profile/upload/2022/04/16/ruoyi.png -- ruoyi.png
     *
     * @param fileName 路径名称
     * @return 没有文件路径的名称
     */
    public static String getName(String fileName) {
        if (fileName == null)
        {
            return null;
        }
        int lastUnixPos = fileName.lastIndexOf('/');
        int lastWindowsPos = fileName.lastIndexOf('\\');
        int index = Math.max(lastUnixPos, lastWindowsPos);
        return fileName.substring(index + 1);
    }

    /**
     * 获取文件后缀名
     * @param fileName 路径名称
     * @return 没有文件路径和后缀的名称
     */
    public static String getFileExpandedName(String fileName) {
        String ext = null;
        if (StringUtils.isNotBlank(fileName) && StringUtils.contains(fileName, ".")){
            int lastIndexOf = fileName.lastIndexOf(".");
            ext = fileName.substring(lastIndexOf +1);
        }
        return ext;
    }

    /**
     * 删除文件夹和文件夹下面的文件
     * */
    public static void deleteDirectory(File fileDir) {
        try{
            if (fileDir.isDirectory()) {
                File[] files = fileDir.listFiles();
                if (files != null) {
                    for (File file : files) {
                        if (file.isDirectory()) {
                            // 递归删除子目录
                            deleteDirectory(file);
                        } else {
                            // 删除文件
                            if (!file.delete()) {
                                log.info("文件删除失败{}", file.getAbsolutePath());
                            }
                        }
                    }
                }
            }
            // 尝试删除空目录
            if (!fileDir.delete()) {
                log.info("文件删除失败");
            }
        }
        catch (Exception exception){
            log.info("文件删除失败");
        }
    }

    public static void main(String[]args){
        File file =  new File("C:\\Users\\huangkai\\Desktop\\test");
        deleteDirectory(file);
    }
}
